php连接mysq数据库代码

看如下语句：
<?
  class connlink{

        private $Address;     //数据库主机名

private $UserName;     //用户名

private $PassWord;     //密码

private $DatabaseName;    //数据库名

private $conn;    //数据库链接标识

private $db_selected;  //数据库选择标识

private $result;      //数据库查询返回结构集

private $fields;

private $rResult;

        function connlink($Address,$UserName,$PassWord,$DatabaseName){

$this->Address=$Address;

$this->UserName=$UserName;

$this->PassWord=$PassWord;

$this->DatabaseName=$DatabaseName;

$this->conn=mysql_connect($this->Address,$this->UserName,$this->PassWord);

if(!$this->conn)

   {

die('数据库连接出现错误: '.mysql_error());

   }

$this->db_selected=mysql_select_db($this->DatabaseName,$this->conn);

}

}

$Address="localhost"; //数据库主机名

$UserName="root"; //用户名

$PassWord="root"; //密码

$DatabaseName="yourdata"; //数据库名

$Conn=mysql_connect($Address,$UserName,$PassWord);

if(!$Conn){

die('数据库连接出现错误: '.mysql_error());

}

mysql_query("set names UTF8"); //解决从数据库中读取中文乱码问题,如果是gb2312可以不设置

$db_selected=mysql_select_db($DatabaseName,$Conn);

$conn=new connlink($Address,$UserName,$PassWord,$DatabaseName);

?>